OAE instruments

TEOAEs vs. DPOAES? : If your doing a complete clinical workup, it would be
important to have both. Each has it's advantages and gives slightly
different and unique info. TEOAEs are more sensitive to subtle cochlear
damage, are "place" specific, better below 1500 Hz, and are less subject to
noise and artifact. DPOAEs use a stronger stimulus thus are capable of
overcoming some conductive issues, and in adults will allow for greater
stimulation above 4K. Between 1500 and 4000, not a lot of difference in
frequency selectivity or specificity between the two choices. Most large
clinics do both when time and money permit. Only Otodynamics products do
both.
For screening, both will work, but TEOAEs are generally alot faster, more
tolerant of noise, artifact, and unhappy kids. DpOAEs can be made to be fast
but you have to give up alot on the numbers of averages and points per
octave to get fast.. A number of school districts are now using TEOAEs to
supplement basic preschool/primary school screenings. A low-cost handheld
TEOAE screener will be available later this year.
Hope this helps.
Lee VanMiddlesworth
Dir. US Operations
Otodynamics Ltd.
lvm1 at erols.com